3.4.11 Power and Control Wiring for Non-
shielded Cables
WARNING
Induced Voltage
Induced voltage from coupled output motor cables
charges equipment capacitors even with the equipment
turned off and locked out. Run motor cables from
multiple adjustable frequency drives separately. Failure
to run output cables separately could result in death or
serious injury.
CAUTION
Compromised Performance
The adjustable frequency drive runs less efficiently if
wiring is not isolated properly. To isolate high frequency
noise, the following in separate metallic conduits:
•
power wiring
•
motor wiring
•
control wiring
Failure to isolate these connections could result in less
than optimum controller and associated equipment
performance.
Because the power wiring carries high frequency electrical
pulses, it is important to run input power and motor
power in separate conduit. If incoming power wiring is in
the same conduit as motor wiring, these pulses can couple
electrical noise back onto the power grid. Isolate control
wiring from high-voltage power wiring.
When shielded/armored cable is not used, at least three
separate conduits are connected to the panel option (see
Figure 3.18).
Stop
Start
Speed
Control
Line
Power
Separate Conduit
Motor
130BB447.10
Figure 3.18 Proper Electrical Installation Using Conduit
Installation Instruction Manual
MG37A222 Danfoss A/S © Rev. 2014-02-07 All rights reserved. 29
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